Mill tool



FIG. 1 is a front elevational view of a mill tool showing my new design;

FIG. 2 is a top elevational view thereof;

FIG. 3 is a perspective view thereof;

FIG. 4 is a second perspective view thereof; and,

FIG. 5 is a back elevational view thereof.

The broken lines illustrate environmental structures and boundaries of the claimed design, and form no part of the claimed design. 

CLAIM The ornamental design for a mill tool, as shown and described. 